Title:
DATA TRANSMISSION ON UNDERSEA PIPELINES
Document Type and Number:
WIPO Patent Application WO1993026115
Kind Code:
A3
Abstract:
PCT No. PCT/GB93/01272 Sec. 371 Date Dec. 13, 1994 Sec. 102(e) Date Dec. 13, 1994 PCT Filed Jun. 15, 1993 PCT Pub. No. WO93/26115 PCT Pub. Date Dec. 23, 1993A sub-sea oil pipeline installation comprising a production platform (10) and sub-sea facilities (15) at a plurality of well-heads (16), has a data transmission system by which data is transmitted in either direction between the master platform (10) and the sub-sea facilities (15) via communication channels formed by the electrically conducting material of the pipelines (12, 14). The data is transmitted in the form of a VLF or ELF electro-magnetic signal which comprises changes of voltage level oscillating about the DC voltage level of the pipe (12, 14) so that the mean level of the signal is the DC voltage level of the pipe (12, 14).
Inventors:
DICKIE NEIL MARSHALL (GB)
HUDSON STEVEN MARTIN (GB)
HUDSON STEVEN MARTIN (GB)
Application Number:
PCT/GB1993/001272
Publication Date:
March 17, 1994
Filing Date:
June 15, 1993
Export Citation:
Assignee:
FLIGHT REFUELING LTD (GB)
International Classes:
F17D5/06; H04B13/02; (IPC1-7): H04N1/40; F17D5/06; H04B13/02; G11B5/588; G11B15/64; G11B15/467; G05B13/02
Foreign References:
| US3551890A | 1970-12-29 | |||
| US3129394A | 1964-04-14 | |||
| EP0468359A2 | 1992-01-29 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 6, no. 95 (E-110)(973) 3 June 1982
OIL AND GAS JOURNAL vol. 86, no. 9, February 1988, TULSA US pages 59 - 64 ALLEN AND BARNES 'Combination of corrosion - survey methods improves protection'
OIL AND GAS JOURNAL vol. 86, no. 9, February 1988, TULSA US pages 59 - 64 ALLEN AND BARNES 'Combination of corrosion - survey methods improves protection'
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